[debugger] flood function for stepping before calling it.

src/arm64/builtins-arm64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/arm64/frames-arm64.h"
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
@@ skipping 561 matching lines @@
     // x1: constructor function
     // x3: new target
     if (is_api_function) {
       __ Ldr(cp, FieldMemOperand(constructor, JSFunction::kContextOffset));
       Handle<Code> code =
           masm->isolate()->builtins()->HandleApiCallConstruct();
       __ Call(code, RelocInfo::CODE_TARGET);
     } else {
       ParameterCount actual(argc);
       __ InvokeFunction(constructor, new_target, actual, CALL_FUNCTION,
-                        NullCallWrapper());
+                        CheckDebugStepCallWrapper());
     }
 
     // Store offset of return address for deoptimizer.
     if (create_implicit_receiver && !is_api_function) {
       masm->isolate()->heap()->SetConstructStubDeoptPCOffset(masm->pc_offset());
     }
 
     // Restore the context from the frame.
     // x0: result
     // jssp[0]: receiver
@@ skipping 1074 matching lines @@
 
   // ----------- S t a t e -------------
   //  -- x0 : the number of arguments (not including the receiver)
   //  -- x1 : the function to call (checked to be a JSFunction)
   //  -- x2 : the shared function info.
   //  -- cp : the function context.
   // -----------------------------------
 
   __ Ldrsw(
       x2, FieldMemOperand(x2, SharedFunctionInfo::kFormalParameterCountOffset));
-  __ Ldr(x4, FieldMemOperand(x1, JSFunction::kCodeEntryOffset));
   ParameterCount actual(x0);
   ParameterCount expected(x2);
-  __ InvokeCode(x4, no_reg, expected, actual, JUMP_FUNCTION, NullCallWrapper());
+  __ InvokeFunctionCode(x1, no_reg, expected, actual, JUMP_FUNCTION,
+                        CheckDebugStepCallWrapper());
 
   // The function is a "classConstructor", need to raise an exception.
   __ bind(&class_constructor);
   {
     FrameScope frame(masm, StackFrame::INTERNAL);
     __ Push(x1);
     __ CallRuntime(Runtime::kThrowConstructorNonCallableError, 1);
   }
 }
 
@@ skipping 364 matching lines @@
   }
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM